 
            IndraLab
Statements
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                                  "Pro-HB-EGF is cleaved at the cell surface to yield the soluble form of HB-EGF (sHB-EGF).  xref  Subsequently, sHB-EGF directly binds to both EGF receptor (EGFR) and ErbB4,  xref  which triggers receptor dimerization and activates downstream kinases, including extracellular signal-regulated kinase (ERK), JNK, and phosphatidylinositol 3-kinase (PI3K).  xref  It has been reported that osteoblast differentiation and bone formation can be regulated by EGFR signaling."